Embedded force measurement

ABSTRACT

Disclosed embodiments relate to a force detection system that detects force exerted on a flexible display based upon changes in resistance and/or capacitance. In one embodiment, a method includes measuring a baseline comprising a baseline resistance or a baseline capacitance or both of a force measurement layer disposed within or overlaid on the display panel. The method further includes detecting a change in the baseline resistance or the baseline capacitance or both and calculating a change location where the change in the baseline resistance or the baseline capacitance or both occurred. The method also includes calculating a magnitude of the change in the baseline resistance or the baseline capacitance or both.

BACKGROUND

The present disclosure relates generally to flexible display panels, andmore particularly, to force measurement in such display panels.

This section is intended to introduce the reader to various aspects ofart that may be related to various aspects of the present disclosure,which are described and/or claimed below. This discussion is believed tobe helpful in providing the reader with background information tofacilitate a better understanding of the various aspects of the presentdisclosure. Accordingly, it should be understood that these statementsare to be read in this light, and not as admissions of prior art.

Many electronic devices include display panels that provide visualimages to a user of the electronic device. These display panels mayallow a user to interact with a graphical user interface of theelectronic devices by enabling touch control of a graphical userinterface. Typically, such touch controls have relied on touchpositioning to interact with the graphical user interface. However,graphical user interfaces that are limited to receiving touch positioninputs may limit the interaction available with the electronic device.

SUMMARY

A summary of certain embodiments disclosed herein is set forth below. Itshould be understood that these aspects are presented merely to providethe reader with a brief summary of these certain embodiments and thatthese aspects are not intended to limit the scope of this disclosure.Indeed, this disclosure may encompass a variety of aspects that may notbe set forth below.

Embodiments of the present disclosure relate to devices and methods fordetecting force measurements (e.g., exerted pressure) of a flexibledisplay panel of an electronic device. In certain embodiments, thedisplay panel force measurements may be useful to detect intentionalpressure exerted on the flexible display panel (e.g., a touch forceinput for a graphical user interface).

Various refinements of the features noted above may exist in relation tovarious aspects of the present disclosure. Further features may also beincorporated in these various aspects as well. These refinements andadditional features may exist individually or in any combination. Forinstance, various features discussed below in relation to one or more ofthe illustrated embodiments may be incorporated into any of theabove-described aspects of the present disclosure alone or in anycombination. Again, the brief summary presented above is intended onlyto familiarize the reader with certain aspects and contexts ofembodiments of the present disclosure without limitation to the claimedsubject matter.

BRIEF DESCRIPTION OF THE DRAWINGS

Various aspects of this disclosure may be better understood upon readingthe following detailed description and upon reference to the drawings inwhich:

FIG. 1 is a schematic block diagram of an electronic device with aflexible display and a force detection system, in accordance with anembodiment;

FIG. 2 is a perspective view of a handheld electronic device including adisplay with flexible regions and the force detection system, inaccordance with an embodiment;

FIG. 3 is a perspective view of a handheld electronic device executingan application that uses the force detection system, in accordance withan embodiment;

FIG. 4 is a cross-sectional side view of the layers of a display usefulfor enabling the techniques disclosed herein, in accordance with anembodiment;

FIG. 5 is a schematic diagram of a force detection system, including aconductive mesh, in accordance with an embodiment;

FIG. 6 is a schematic representation of a force being applied to theflexible display, in accordance with an embodiment; and

FIG. 7 is a flow chart depicting a process for detecting forces appliedto the flexible display, in accordance with an embodiment.

DETAILED DESCRIPTION OF SPECIFIC EMBODIMENTS

One or more specific embodiments will be described below. In an effortto provide a concise description of these embodiments, not all featuresof an actual implementation are described in the specification. Itshould be appreciated that in the development of any such actualimplementation, as in any engineering or design project, numerousimplementation-specific decisions must be made to achieve thedevelopers' specific goals, such as compliance with system-related andbusiness-related constraints, which may vary from one implementation toanother. Moreover, it should be appreciated that such a developmenteffort might be complex and time consuming, but would nevertheless be aroutine undertaking of design, fabrication, and manufacture for those ofordinary skill having the benefit of this disclosure.

As may be appreciated, electronic devices may include various componentsthat contribute to the function of the device. For instance, FIG. 1 is ablock diagram illustrating components that may be present in one suchelectronic device 10. The various functional blocks shown in FIG. 1 mayinclude hardware elements (including circuitry), software elements(including computer code stored on a computer-readable medium, such as ahard drive or system memory), or a combination of both hardware andsoftware elements. FIG. 1 is only one example of a particularimplementation and is merely intended to illustrate the types ofcomponents that may be present in the electronic device 10. For example,in the presently illustrated embodiment, these components may include aflexible display 12 (e.g., a display enabled to deflect or flex in oneor more regions), a force detection system 14 coupled to the flexibledisplay 12, input/output (I/O) ports 16, input structures 18, one ormore processors 20, one or more memory devices 22, non-volatile storage24, and a network interface 26. The network interface 26 may providecommunications capabilities through a wired (e.g., Ethernet) or wireless(e.g., Wi-Fi) network.

The flexible display 12 may be used to display various images generatedby the electronic device 10. For example, the processor 20 may provideimage data to the flexible display 12. Further, the non-volatile storage24 may be configured to store image data provided by the processor 20.The flexible display 12 may be any suitable flexible display, such as anorganic light-emitting diode (OLED) display. Additionally, the flexibledisplay 12 may have touch-sensing capabilities that may be used as partof the control interface for the electronic device 10.

The flexible display 12 may be coupled to the force detection system 14,controlled by the processor 20. As will be described in more detailbelow, the force detection system 14 may enable the processor 20 todetect a magnitude of touch in the flexible display 12. Informationabout these magnitudes of touch may be stored in the non-volatilestorage 24 or communicated to an external entity (e.g., through use ofthe I/O ports 16 or the network interface 26).

The electronic device 10 may take the form of a cellular telephone orsome other type of electronic device. In certain embodiments, electronicdevice 10 in the form of a handheld electronic device may include amodel of an iPod® or iPhone® available from Apple Inc. of Cupertino,Calif. By way of example, an electronic device 10 in the form of ahandheld electronic device 30 (e.g., a cellular telephone) isillustrated in FIG. 2 in accordance with one embodiment. The depictedhandheld electronic device 30 includes a flexible display 12 (e.g., inthe form of an OLED or some other suitable flexible display), I/O ports16, and input structures 18.

Although the electronic device 10 is generally depicted in the contextof a cellular phone in FIG. 2, an electronic device 10 may also take theform of other types of electronic devices. In some embodiments, variouselectronic devices 10 may include media players, personal dataorganizers, handheld game platforms, cameras, and combinations of suchdevices. For instance, the electronic device 10 may be provided in theform of handheld electronic device 30 that includes variousfunctionalities (such as the ability to take pictures, make telephonecalls, access the Internet, communicate via email, record audio andvideo, listen to music, play games, and connect to wireless networks).In another example, the electronic device 10 may also be provided in theform of a portable multi-function tablet computing device. By way ofexample, the tablet computing device may be a model of an iPad® tabletcomputer, available from Apple Inc. Alternatively, the electronic device10 may also be provided in the form of a desktop or notebook computerwith the flexible display 12. For example, the desktop or notebookcomputer may be a model of an iMac®, MacBook Air®, or MacBook Pro®equipped with a flexible display 12. Alternatively, the electronicdevice 10 may also be provided in the form of a television, a large-areavideo player, or a device used for electronic gaming. Alternatively, theelectronic device 10 may also be provided in the form of digitalsignage, a public information display, or other display device with apurpose to convey advertising or information. Although the followingdisclosure uses the handheld device 30 by way of example, it should beunderstood that the force detection system 14 may be employed in likefashion in any suitable form factor, such as those mentioned above.

In the depicted embodiment, the handheld electronic device 30 includesthe flexible display 12 with the force detection system 14 of FIG. 1.The flexible display 12 may display various images generated by thehandheld electronic device 30, such as a graphical user interface (GUI)38 having icons 40. A user may interact with the handheld device 30 byaccessing the user inputs 18 and accessing the GUI 38 through touchingthe flexible display 12. In certain embodiments, the force detectionsystem 14 may aid in the user interaction with the GUI 38 of thehandheld electronic device 30. For example, when a user exerts a forceupon the flexible display 12, one or more layers of the flexible display12 may flex inward. The force detection system 14 may detect thelocation and magnitude of the flex and provide a user input signal tothe processor 20 based upon the location and magnitude of the flex.

In certain embodiments, the GUI 38 may be enabled to provide a varietyof functionalities based upon an amount of force provided to the GUI 38.In one embodiment, an icon may be enabled to affect a change atdifferent rates based upon a pressure exerted on the icon. For example,in the depicted embodiment, the volume icons 41 may be enabled toincrease or decrease a volume of the handheld electronic device 30 in 1dB increments when a light force is provided to the volume icons 41.When a heavy force is applied to the icons 41, the volume may beincreased or decreased at a higher increment (e.g., 5 dB). In someembodiments, the force detection system 14 may be enabled to providelevels (e.g., low, medium, and high) of force to the processor 20 orother data processing circuitry based upon the magnitude of force of theflexible display 12 breaching certain thresholds. In other embodiments,the force detection system 14 may provide a continuously variable amountof force based upon the actual magnitude of force.

As will be described in more detail below, the flexible display 12 mayinclude one or more flexible regions 44 that provide enhancedflexibility of the flexible display 12. The flexible regions 44 may beplaced in regions of high activity (e.g., regions of the flexibledisplay 12 where touch commands are likely to occur). For example, asdepicted in the embodiment of FIG. 2, the flexible region 44 is placedaround the areas of the flexible display 12 where the GUI 38 is likelyto receive touch inputs (e.g., where the GUI 38 provides icons 40 and/or41). The flexible display 12 may also include less flexible regions 46with little to no flexibility. For example, in the embodiment of FIG. 2,the edges and corners of the flexible display 12 are less flexibleregions 46. The less flexible regions 44 may protect the flexibledisplay 12 by providing increased rigidity of the flexible display 12 inareas where magnitudes of force inputs may less-likely occur.

Turning now to a more detailed discussion of how a GUI 38 of thehandheld device 30 may interact with the magnitude of touch inputs, FIG.3 illustrates the handheld device 36 running a music creationapplication, such as GarageBand by Apple Inc. that uses magnitude oftouch inputs. As previously discussed, the flexible display 12 providesflexible regions 44 that enable enhanced flexibility of the flexibledisplay 12. As previously discussed, the flexible regions 44 may beplaced anywhere on the flexible display 12. The GUI 38 may provide oneor more virtual instruments (e.g., a piano 50 and/or a drum 52). As auser touches the keys 54 of the piano 50 or drumsticks 56A and/or 56 ofthe drum 52, the handheld device 30 may provide a visual and/or audioindication of a note (e.g., 58A, 58B, 58C, and/or 58D) being played. Itmay be beneficial to interact with the GUI 38 based upon magnitude oftouch inputs. For example, when playing a piano, pressing keys withincreased force may result in louder notes. Thus, by determining amagnitude of force input, the audible and visual indicators of the notesmay provide variations in the loudness of notes. For example, the GUI 38may provide a visual representation of notes 56A and 56B when keys 54 onthe piano are pressed. Depending on the magnitude of force used to pressthe keys 54, the GUI 38 may provide variable loudness indicators 58. Forexample, the magnitude of force used to play note 56A was less than themagnitude of force used to play note 56B, as indicated by the loudnessindicators 58. Similarly, the magnitude of force used to play note 56Cis greater than the magnitude of force used to play note 56D, as isindicated by the loudness indicators 58.

As previously discussed, the flexible display 12 may be enabled toprovide one or more flexible regions 44, such that more accuratemagnitude of force measurements may be obtained through the flexibledisplay 12. FIG. 4 illustrates a cross-sectional view of the layerspresent in a particular embodiment of the flexible display 12. In thisembodiment, the flexible display 12 includes an OLED panel 68. The OLEDpanel 68 includes a substrate layer 70 (e.g., a polyethyleneterephthalate (PET) substrate layer) on which a thin film transistor(TFT) layer may be formed. The TFT layer may define the various pixelsof the OLED display and allow each pixel to be separately addressed. Inone embodiment, each pixel may include a layer or layers of organiclight emitting diodes 72 printed, deposited, or otherwise formed on thesubstrate layer 70 and the TFT layer. Each of the light emitting diodes72 may emit specific colors (e.g., red, green, and blue) such that theircolor combined with other light emitting diodes 72 may form a colorimage. In alternative embodiments, the light emitting diodes 72 may eachemit white and a color filter may transform the white light intospecific colors (e.g., red, green, and blue). The operation of the TFTlayer and the corresponding pixels of the OLED panel 68 may becoordinated and/or controlled by one or more driver chips 74 (such as achip-on glass (COG), chip-on flex (COF), or gate-in-panel (GIP)) incommunication with the TFT layer and/or the one or more processors 20(FIG. 1).

The OLED panel 68 may also include a cover or external layer 76 (e.g., acover glass or plastic) that forms the external viewing surface facing aviewer. In certain embodiments the cover layer 76 may perform variouscolor filtration and/or polarization functions with respect to the lightemitted by the OLED panel 68. In one embodiment, the cover layer 76 andthe substrate layer 70 may be bonded together, such as by a glass fritbond 78, along all or part of the periphery of the surface and/orsubstrate layers. In one implementation, the OLED panel 68 is betweenabout 0.03 mm and 1.9 mm in thickness. The thickness of the OLED panel68 may directly impact flexibility of the OLED panel 68.

To create the flexible regions 44, the external layer 76 may be thinned.For example, in the embodiment depicted in FIG. 4, one flexible region44 is created by thinning the external layer 76. As depicted, thethickness 84 of the external layer 76 is less at the flexible region 44than the thickness 86 outside of the flexible region 44. In certainembodiments, the external layer 76 may be thicker near the edges of theexternal layer 76 to protect the flexible display 12 (e.g., from a drop)by providing a framed rigidity. However, in areas of high activity(e.g., the central area of the flexible display 12) a thinned externallayer 76 may enhance the flexibility of the flexible display 12 suchthat more defined force measurements may be obtained.

As will be discussed in more detail below, the flexible display 12 mayinclude a force measurement layer 82. As force is applied to the forcemeasurement layer 82, attributes of the force measurement layer 82change. The processor 20 (FIG. 1) or other data processing circuitry maymeasure the attribute changes, and determine a magnitude of force beingapplied to the flexible display 12. The force measurement layer 82 mayinclude any material that is capable of being measured for changes inforce. For example, in some embodiments, the force measurement layer 82may include one or more thin film plates that vary in capacitance whenforce is applied to the plates. In some embodiments, the forcemeasurement layer 82 may include one or more strain gauges that vary inresistance when force is applied. Other embodiments of the forcemeasurement layer 82 may include an embedded layer that allowspiezoelectric, optical, or any other measurement to obtain a magnitudeof force. While shown in a separate layer disposed behind the OLED panel68 in the embodiment depicted in FIG. 4, the force measurement layer 82may be disposed in other areas of the flexible display 12. For example,the force measurement layer 82, in the form of one or more straingauges, may be embedding in the substrate layer 79, the pixel layer 72,and/or the TFT layer.

FIG. 5 illustrates an embodiment of a force detection system 14 using astrain gauge 100. FIG. 6 illustrates an example of force being appliedto the flexible display 12 and FIG. 7 provides a process for detectingthe force being applied to a flexible display 12. For clarity, FIGS. 5-7will be discussed jointly. The strain gauges 100 may be disposed withinor overlaid on the flexible display 12. The strain gauges 100 may be mayinclude an array of rows 102 and columns 104 of crossing conductivewires. The rows 102 and columns 104 may be disposed on separate planes,such that they only touch at crossing points when a force is applied tothe rows 102 and/or columns 104. In some embodiments, the wires mayconsist of Indium Tin Oxide (ITO). In other embodiments, the wires maycomprise of carbon nantubes, grapheme, silver nanowires, coppernanowires, gold nanoparticles, metal oxide nanoparticles, or otherconductive nanoscale materials. The resolution of the mesh layer 100 maybe very fine (e.g., each wire may be very thin and close to the otherwires). For example, the wires may have a diameter of approximately 10microns and/or may be spaced within 70 microns of each other. As thewires of the strain gauges 100 (e.g., rows 102 and columns 104) stretch,they become narrower and longer, causing the resistance and/orcapacitance of wires change. Thus, the resistance and/or capacitance ofthe force measurement pixels 106 (e.g., areas where the wires cross) mayalso change. For example, as a force 110 is applied to the flexibledisplay 12, some wires of the strain gauge 100 may stretch and somewires of strain gauge 100 may compress. To determine the magnitude offorce being exerted on the flexible display 12, resistance and/orcapacitance changes in the strain gauge 100 may be measured. To do this,baseline resistance and/or capacitance measurements may be obtained(block 202). For example, the rows 102 and columns 104 may be coupled tothe measurement circuitry 108. The measurement circuitry 108 may measurea baseline resistance and/or capacitance at portions of the strain gauge100 where the rows 102 and columns 104 intersect (e.g., the forcemeasurement pixels 106).

When a force 110 is exerted on the flexible display 12, the resistanceand/or capacitance of the wires will change. For example, as illustratedin FIG. 6, a downward force 110 is exerted on the flexible display 12.The downward force 110 may cause the wires to compress 112 at one ormore force measurement pixels 106. As the wires compress 112, theresistance may decrease (and thus the capacitance may increase). Themeasurement circuitry 108 may periodically or continuously measure theresistance and/or capacitance of the strain gauges 100 at the forcemeasurement pixels 106. The processor 20 (FIG. 1) via a driver orinstructions for the processor 20 may detect the change in resistanceand/or capacitance based upon the measurements by the measurementcircuitry 108 (block 204).

In certain embodiments, the force measurements may be associated withresistance and/or capacitance values that transition rapidly compared toother stimuli that may affect the resistance and/or capacitance (e.g.,temperature changes). For example, the exerted force may causeresistance and/or capacitance values in the strain gauges 100 to shiftrapidly, (e.g., due to the wire stretching rapidly). Thus, slowlytransitioning variations in resistance and/or capacitance (e.g., thosecaused by temperature changes) may be filtered with a low frequencyfilter (e.g., a high pass filter) (block 205). The measurement circuitry108 may then provide the filtered resistance and/or capacitancemeasurements to the processor 20 or other data processing circuitry.

Upon finding a change in the baseline resistance and/or capacitance, theforce detection system 14 may determine a location (e.g., locations ofthe resistance pixels 106) where the change occurred (block 206).Further, the measure of the change in the resistance and/or capacitancefrom the baseline may be measured by the measurement circuitry 108 tocalculate a magnitude of change (block 208).

As previously discussed, the rows 102 and columns 104 of wires may bevery small. Thus, the wires may include a very low resistance.Therefore, the change in resistance and/or capacitance based upon theexerted force may also be quite low. The measurement circuitry 108 mayinclude very sensitive measurement circuitry to account for the very lowresistance levels. In certain embodiments, the change in resistance ofthe wires may be on the order of micro-ohms.

Certain processor instructions executed on the electronic device mayutilize information relating to the exerted force location and/orexerted force magnitude rather than a resistance and/or capacitancechange location and magnitude. Thus, in some embodiments, it may bebeneficial to associate the location of the resistance and/orcapacitance change with an exerted force location (e.g., the location ofthe force measurement pixels 106 where the change occurred) (block 210)and associate the magnitude of change in the resistance and/orcapacitance with a magnitude of force exerted upon the flexible display12 (block 212). In certain embodiments, a lookup table stored in thenon-volatile storage 24 may associate magnitude of force values withspecific resistance change values. Using the lookup table, the processor20 may associate the resistance and/or capacitance change with amagnitude of force exerted on the handheld electronic device 30.

In certain embodiments, it may be desirable to reset (e.g., re-measure)the baseline periodically. Over time, the strain gauges 100 may retainsome of the capacitance and/or resistance changes caused by forcesexerted on the flexible display 12. Resetting the baseline may help toensure that any retained capacitance and/or resistance changes are takeninto account when determining the changes in resistance and/orcapacitance of the wires. The baseline may be measured at pre-determinedtime periods or upon the occurrence of certain events. For example, thebaseline might be re-measured daily at midnight or once per month at3:00 A.M. In other embodiments, the baseline may be reset by through ata manufacturer's facility when the handheld electronic device 30 isbrought in for repair. In cellular telephone embodiments, the baselinemay be reset automatically each time a new cellular service tower isencountered by the cellular telephone. Further, the baseline may bereset through the use of a menu setting displayed on the GUI 38.

Locating and measuring exerted force upon a flexible display 12 may beuseful in detecting intentional magnitudes of force applied to theflexible display 12. For example, intentional display panel strain maybe useful in providing a more dynamic GUI 38 that takes into account anamount of force that is being applied via touch input to the flexibledisplay 12.

The specific embodiments described above have been shown by way ofexample, and it should be understood that these embodiments may besusceptible to various modifications and alternative forms. It should befurther understood that the claims are not intended to be limited to theparticular forms disclosed, but rather to cover all modifications,equivalents, and alternatives falling within the spirit and scope ofthis disclosure.

What is claimed is:
 1. An electronic device, comprising: a flexibledisplay configured to provide a graphical user interface of theelectronic device, the flexible display comprising one or more flexibleregions configured to add flexibility to the flexible display; a forcemeasurement layer disposed in or on the flexible display, having anattribute with a baseline measurement; and a processor configured to:detect a variation from the baseline measurement in the forcemeasurement layer; associate a location of the variation from thebaseline measurement with a force input location; associate a magnitudeof the variation from the baseline attribute with a magnitude of forceof a force input; and provide a graphical user interface inputinstruction based at least in part upon the force input location, themagnitude of force, or both.
 2. The electronic device of claim 1,wherein the flexible display comprise an organic light-emitting diode(OLED) display.
 3. The electronic device of claim 1, wherein theflexible display comprises: a substrate layer; a pixel layer comprisinga plurality of pixels; a thin film transistor (TFT) layer, configured toenable separate addressing of each of the plurality of pixels; and acover layer configured to cover an external viewing surface of the OLEDdisplay.
 4. The electronic device of claim 3, wherein the forcemeasurement layer is embedded in the substrate layer.
 5. The electronicdevice of claim 3, wherein the force measurement layer is embedded inthe pixel layer.
 6. The electronic device of claim 3, wherein the forcemeasurement layer is embedded in the TFT layer.
 7. The electronic deviceof claim 3, wherein the flexible regions comprise areas in the coverlayer that are thinned for increased flexibility.
 8. The electronicdevice of claim 3, wherein the cover layer is thinned in a centralregion of the cover layer.
 9. The electronic device of claim 3, whereinthe cover layer comprises an increased thickness near the edges,corners, or both of the cover layer.
 10. A force detection system,comprising: a flexible display configured to provide a graphical image,comprising flexible regions configured to provide flex to the flexibledisplay; a force measurement layer disposed on or in the display, havingan attribute with a baseline measurement; and force measurementcircuitry, configured to: determine the baseline measurement of theforce measurement layer; detect a change in the baseline measurement inat least one portion of the force measurement layer; store changeinformation relating to the change in the baseline measurement; andassociate the change information with a force exerted on the display.11. The force detection system of claim 10, wherein the flexible displaycomprises a cover layer that comprises thinned regions configured toprovide increased flexibility in the flexible regions.
 12. The forcedetection system of claim 11, wherein the cover layer comprises thethinned regions in regions of the display where touch inputs are likelyto occur.
 13. The force detection system of claim 10, wherein the forcemeasurement layer comprises one or more strain gauges that decrease inresistance when compressed.
 14. The force detection system of claim 10,wherein the force measurement layer comprises one or more thin filmplates that vary in capacitance when force is applied.
 15. The forcedetection system of claim 10, wherein the force measurement circuitry isconfigured to detect a change in the baseline resistance of an order ofmicro-ohms.
 16. The force detection system of claim 10, wherein theforce measurement circuitry is configured to detect a change in thebaseline capacitance of an order of micro-ohms.
 17. The force detectionsystem of claim 10, wherein the force measurement circuitry isconfigured to: store a location and a magnitude of change in resistanceor change in capacitance, or both; calculate a force input locationbased upon the location of the change in a baseline resistance or thechange in a baseline capacitance, or both; and calculate a magnitude offorce input based upon the magnitude of the change in the baselineresistance or the change in the baseline capacitance or both.
 18. Theforce detection system of claim 10, wherein the force measurementcircuitry is configured to detect the change in the baseline attributeat periodic polling increments.
 19. The force detection system of claim10, wherein the force measurement circuitry is configured to remove thestored location and the stored magnitude of the change in the baselineattribute at periodic intervals.
 20. The force detection system of claim10, wherein the force measurement circuitry is configured to determinethe baseline attribute at periodic intervals.
 21. The force detectionsystem of claim 10, wherein the force measurement circuitry isconfigured to re-determine the baseline attribute as the displaydeformation detection system passes a cellular tower.
 22. A method ofcontrolling a graphical user interface (GUI) using a magnitude of forcein a flexible display panel, comprising: detecting a change in abaseline attribute of a force measurement layer disposed within oroverlaid on the display panel; calculating a magnitude of the change inthe baseline attribute; calculating the magnitude of force based atleast in part upon the magnitude of change; and determining a touchcommand input based at least in part upon the magnitude of force. 23.The method of claim 22, comprising filtering low frequency changes inthe baseline resistance or the baseline capacitance, or both, via a highpass filter prior to calculating the magnitude of force.
 24. The methodof claim 22, wherein the touch command input includes a force of thetouch command associated with the magnitude of change.
 25. The method ofclaim 22, wherein the touch command input includes both a location ofthe touch command associated with the change location and a force of thetouch command associated with the magnitude of change.
 26. The method ofclaim 22, comprising providing the touch command input to the GUI.